Annoyance Due to Environmental Low Frequency Noise and Source Location — A Case Study

1989 ◽  
Vol 8 (2) ◽  
pp. 30-39 ◽  
Author(s):  
R.N. Vasudevan ◽  
H.G. Leventhall
Keyword(s):  
Field Study ◽  
Microphone Array ◽  
Low Frequency ◽  
Source Location ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Noise Levels ◽  
Industrial Source

This case study shows that objective criteria usually based solely on the dB(A) scale are not adequate in evaluating the annoyance due to low frequency noise. Levels which are often low enough to discount the likelihood of a noise nuisance, however, were found to be subjectively annoying. The field study reported here demonstrates that the complainant's annoyance response was due more to the unpleasant nature of the low frequency noise than to its actual level. Positive location of a distant industrial source with the aid of a specially designed three element microphone array provided much needed relief to the complainant.

An Integrated Acoustic/Microseismic Approach to Monitoring Low Frequency Noise & Vibration — A Case Study

2003 ◽  
Vol 10 (1) ◽  
pp. 77-95 ◽  
Author(s):  
Ian Rushforth ◽  
Andy Moorhouse ◽  
Peter Styles
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Industrial Site ◽  
Low Frequency Noise ◽  
Integrated Method ◽  
Source Determination ◽  
Vibration Problems ◽  
Noise Vibration ◽  
Technique Comparison

It is proposed that low frequency noise/vibration problems are best tackled by a combination of acoustic and microseismic methods, rather than using each method in isolation. A new integrated method was devised and it was demonstrated that ‘the whole is greater than the sum of the parts’. The benefits and versatility of the new method are illustrated with reference to a case study. Unmanned monitoring took place at several houses near to an industrial site, using a multi-channel recording technique. Comparison of various components of the sound and vibration fields in each house was then carried out, which allowed various propagation paths to be distinguished. A range of further signal processing analyses was also employed to aid source determination.

Advanced acoustical material tuned for low frequency noise reduction: a case study

2008 ◽  
Vol 123 (5) ◽  
pp. 3811-3811
Author(s):  
Kathleen Kondylas ◽  
Natalia Levit ◽  
Joseph A. King ◽  
Chris R. Fuller
Keyword(s):  
Noise Reduction ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise

scholarly journals On the Control of Low-Frequency Audible Noise from Electrical Substations: A Case Study

2020 ◽  
Vol 10 (2) ◽  
pp. 637 ◽  
Author(s):  
Edoardo Alessio Piana ◽  
Nicolaas Bernardus Roozen
Keyword(s):  
Power Distribution ◽  
Distribution Systems ◽  
Methodological Approach ◽  
Low Frequency ◽  
Mitigation Measures ◽  
Propagation Path ◽  
Frequency Noise ◽  
Subjective Response ◽  
Low Frequency Noise

With the world facing the urgency of energy transition, the development of efficient and quiet electrical infrastructures is of topical importance in the construction of the environment of the future. The problem of noise from power distribution systems is often underestimated, although several works in the literature underline the effect of disturbance on the population, especially concerning the low frequency range. This paper overviews the issue of the low-frequency noise generated by electrical substations, from the experimental characterization of the source to the possible mitigation measures at the source, along the propagation path and at the receiver. Alongside the general presentation, a case study serves as a practical demonstration of the proposed methodological approach. It was found that in the investigated situation the main disturbance comes from the transformer at two low-frequency harmonics of twice the networking frequency. A traditional noise barrier is designed taking into account the strict size constraints imposed by technical compatibility with the electrical infrastructure, which limits its efficacy at low frequency. Noise masking with broadband signals can be a complementary solution to further reduce noise disturbance and contain it within prescribed limits. The evaluation of subjective response of the receivers to different mitigation solutions is made possible by the availability of the impulse response.

Recurrence Plot Analysis of HRV for Exposure to Low-Frequency Noise

2014 ◽  
Vol 1044-1045 ◽  
pp. 1251-1257 ◽  
Author(s):  
Shih Tsung Chen ◽  
Chia Yi Chou ◽  
Li Ho Tseng
Keyword(s):  
Low Frequency ◽  
Cardiovascular Responses ◽  
Recurrence Plot ◽  
Frequency Noise ◽  
Cardiovascular Activity ◽  
Low Frequency Noise ◽  
Noise Levels ◽  
Noise Condition ◽  
Plot Analysis ◽  
Recurrence Plot Analysis

Previous studies have indicated that the chronic effects of exposure to low-frequency noise causes annoyance. However, during the past two decades, most studies have employed questionnaires to characterize the effects of noise on psychosomatic responses. This study investigated cardiovascular activity changes in exposure to low-frequency noise for various noise intensities by using recurrence plot analysis of heart rate variability (HRV) estimation. The authors hypothesized that distinct noise intensities affect cardiovascular activity, which would be reflected in the HRV and recurrence quantification analysis (RQA) parameters. The test intensities of noises were no noise, 70-dBC, 80-dBC, and 90-dBC. Each noise level was sustained for 5 min, and the electrocardiogram (ECG) was recorded simultaneously. The cardiovascular responses were evaluated using RQA of the beat-to-beat (RR) intervals obtained from ECG signals. The results showed that the mean RR interval variability and mean blood pressure did not substantially change relative to the noise levels. However, the length of the longest diagonal line (Lmax) of the RQA of the background noise (no noise) condition was significantly lower than the 70-dBC, 80-dBC, and 90-dBC noise levels. The laminarity showed significant changes in the noise levels of various intensities. In conclusion, the RQA-based measures appear to be an effective tool for exposure to low-frequency noise, even in short-term HRV time series.

scholarly journals Low-frequency noise inδ13C andδ18O tree ring data: A case study ofPinus uncinatain the Spanish Pyrenees

2010 ◽  
Vol 24 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jan Esper ◽  
David C. Frank ◽  
Giovanna Battipaglia ◽  
Ulf Büntgen ◽  
Christopher Holert ◽  
...  
Keyword(s):  
Tree Ring ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Tree Ring Data ◽  
Spanish Pyrenees

A Case Study of Low Frequency Noise Assessed Using DIN 45680 Criteria

Noise Notes ◽  
2004 ◽  
Vol 3 (1) ◽  
pp. 3-18 ◽  
Author(s):  
Ian Rushforth ◽  
Andy Moorhouse ◽  
Peter Styles
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise

Original waveform of lung sound crackles: a case study of the effect of high-pass filtration

1991 ◽  
Vol 71 (6) ◽  
pp. 2173-2177 ◽  
Author(s):  
T. Katila ◽  
P. Piirila ◽  
K. Kallio ◽  
E. Paajanen ◽  
T. Rosqvist ◽  
...  
Keyword(s):  
Low Frequency ◽  
Final Analysis ◽  
Sound Signal ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Lung Sound ◽  
High Pass

In lung sound research, low-frequency noise usually disturbs the sound signal being recorded. Some researchers therefore use high-pass filtration before the final analysis. In this study, the effect of digital and analog high-pass filtration on the morphology of the lung sound crackles is evaluated. The original nonprefiltered crackle waveform is presented, and the effect of the high-pass filtration on the crackle waveform characteristics is elucidated in one patient with silicoasbestosis.

scholarly journals A Case Study of Low Frequency Noise Assessed Using DIN 45680 Criteria

2002 ◽  
Vol 21 (4) ◽  
pp. 181-198 ◽  
Author(s):  
Ian Rushforth ◽  
Andy Moorhouse ◽  
Peter Styles
Keyword(s):  
Measurement Techniques ◽  
Low Frequency ◽  
National Standard ◽  
Acoustic Measurement ◽  
Frequency Noise ◽  
Industrial Site ◽  
Low Frequency Noise ◽  
Industrial Estate ◽  
Resultant Data

This paper describes a case study in which low frequency noise was suspected of causing disturbance in a semi-rural location close to an industrial estate. Previous attempts using conventional acoustic measurement techniques to resolve the case, or even prove the existence of a real acoustic problem, had proved unsuccessful. In the present study, the authors applied a novel integrated acoustic/microseismic measurement system, and assessed the resultant data using criteria from the German national standard DIN 45680. Using this approach, the authors successfully resolved the low frequency noise problem and, after a test involving a sequential shutdown at a suspect industrial site, established the precise cause of the disturbance. The paper thus supports the criteria in DIN 45680 as a predictor of annoyance due to low frequency noise and as an aid in resolving such problems. It also illustrates the flexibility of the combined acoustic/microseismic technique and the advantages of the method over conventional techniques.

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